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LibrAlign is an open source Java library providing GUI components for displaying and editing multiple sequence alignments (MSAs) and attached raw- and metadata.

It is distributed under LGPL. More information can be found at

Key features

  • Flexible and powerful GUI components for displaying one or a set of MSAs together
  • Data areas can be attached to each sequence or alignment. A set of predefined data areas is included and custom areas can easily be added using the API interfaces.
  • All GUI components are based on TIC and can therefore be used both in Swing and SWT (including Eclipse RCP) applications.
  • Reading and writing data and metadata from and to numerous alignment formats using JPhyloIO
  • Different extensible data model implementations, including compressed sequence storage to handle large datasets
  • Interoperability with BioJava

Getting started

A documentation and a full JavaDoc are available. A basic demo application can be found here.

If you have further questions, feel free to ask one on our ResearchGate project page or contact

Source code

This GitHub repository in a synchronized mirror of the master repository at bioinfweb. Feedback and pull requests are welcome. Synchronization was made possible by SubGit.


If you want to submit a bug report or feature request, please use our public bug tracking system at (We do not manage issues on GitHub directly.)


The latest versions of LibrAlign are distrubuted under GNU General Lesser Public License Version 3. See NOTICE.txt for further details.

This product includes dependencies developed by the Apache Software Foundation distributed under the terms of the Apache License Version 2.0.

Binary releases

Binary releases and Maven code can be found at

About bioinfweb


A Java GUI library for displaying and editing multiple sequence alignments and attached raw- and metadata





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